who was declared the Son of God with power by the resurrection from the dead, according to the Spirit of holiness, Jesus Christ our Lord,Romans 1:4(NASB)
Having just been reminded in the previous verse that the Lord Jesus was fully human having been: made of the seed of David, according to the flesh, which gave Him the right to the throne of Israel - we now read that Jesus Christ was also: declared the Son of God with power, because He was resurrected from the dead, by God's Holy Spirit.
Isaiah tells us that Jesus was the Son of Man that was born as well as the Son of God that was given, and Paul confirms that He is of the earthly seed of David while at the same time being declared to be Son of God.
It is only as Man could Jesus be identified with the human race and offer His perfect life for the sins of the world, but only as God was He good enough to pay the price for sin. Christ had to be God and Man to qualify as our Redeemer.
But the wonderful proof that God the Father accepted the sacrifice of Christ the Son on our behalf, was His resurrection. It is this wonderful substitutionary death and glorious resurrection that constitutes the Gospel - for which the apostle Paul was set apart by both the Father and the Son - and which was promised before times in the holy Scriptures.
Thank You Lord for Your grace towards us who were dead in trespasses and sins but who have now been brought near by the death and resurrection of Christ, in Whose name we pray, AMEN.